Auditory processing disorder (also known as central auditory processing disorder or CAPD) is a condition that makes it hard for kids to recognize subtle differences between sounds in words. It affects their ability to process what other people are saying.
Gallium is a solid metal at room temperature, but it melts in your hands. 00:09. When gallium is in its liquid state, if feels like cold melted solder in your hands. 00:33. Melting gallium onto aluminum makes the aluminum brittle enough to break with your fingers.
In an effort to thwart a melt off of pennies in 1982, the United States Mint made half of the pennies out of solid copper and the other half out of copper plated zinc. Although it is illegal to melt pennies and sell the raw metal, people still pull the solid copper pennies out of circulation in order to save them for their copper value.